Borneo Orangutan Survival Foundation UK
- The UK branch of the Balikpapan Orangutan Survival Foundation aims to promote the preservation of orangutans and their rainforest habitat.
- http://www.savetheorangutan.co.uk

WWF - Orang-utan
- Biology and conservation issues.
- http://www.panda.org/about_wwf/what_we_do/species/about_species/species_factsheets/great_apes/orangutans/index.cfm

Pongo pygmaeus
- Information about the orangutan from the Animal Diversity Web.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Pongo_pygmaeus.html

Ralph Arbus's Gallery of Orangutan Photos
- A large collection of photographs of orangutans of the Tanjung Puting National Park and Orangutan Care Center and Quarantine in Borneo.
- http://www.orangutanpix.info/

Balikpapan Orangutan Survival Foundation
- Reintroduction program for confiscated orangutans on the island of Borneo. News, information, and images.
- http://www.savetheorangutan.info/

Orangutan Sanctuary
- Provides information and resources for professionals working to save the orangutan in rehabilitation sites and sanctuaries.
- http://www.yorku.ca/arusson/

The World of the Orangutan
- Conservation information about the orangutan in Indonesia. In English, German, and Dutch.
- http://orangutan.flevoland.to/

Orangutan Health Project
- Research project based in Sumatra investigating the use of medicinal plants by orangutans. Includes photo gallery and volunteer program.
- http://www.orangutan-health.org/

Orangutan Foundation International
- Committed to saving orangutans through wildlife research, rainforest preservation, conservation and education.
- http://www.orangutan.org